Torsional extreme-plastic processing method of conic metal pipe Grant US-9447487-B2 United States of America 20 Sep 2016
TORSIONAL EXTREME-PLASTIC PROCESSING METHOD OF CONIC METAL PIPE Application EP-2808101-A4 European Patent Office 21 Oct 2015
TORSIONAL EXTREME-PLASTIC PROCESSING METHOD OF CONIC METAL PIPE Application EP-2808101-A1 European Patent Office 03 Dec 2014